Review 3: Digital Continuous Rotation (360°) Servo Part 1

RE: Review 3: Digital Continuous Rotation (360°) Servo Part 1

neilk — Mon, 06 Apr 2015 10:21:26 GMT

[mention:acaf6a9338de4eef8f6717d5561ed01d:e9ed411860ed4f2ba0265705b8793d05] Jan. I'm fairly new to using motors and have seen lots of references to using continuous rotation servos instead of simple DC motors in robot projects. Can you (or any one else) confirm why this might be preferred?

Continuous rotation servo comes with it;s own motor driver - no need for an H-bridge.
Continuous rotation servo is controlled with a single PWM pin, since reverse, stop and forward, as well as speed are all determined purely by duty cycle.

Are there any other benefits?

RE: Review 3: Digital Continuous Rotation (360°) Servo Part 1

balearicdynamics — Sat, 04 Apr 2015 08:44:33 GMT

I have a 360 servo for continuous rotation too but I see that these parameters seems working partially, the servo don't stop at the position. I think that the best and more precise way to control this kind of servos is using writeMillis() instead of the bare write() to manage better the PWM frequency from which the servo manages the speed.

For example, in my particular case, the producer gives all the PWM frequency specifications for motion and rest position setting. If interested, you find more in this link (maybe you can find something similar for your servo model): http://www.phidgets.com/products.php?product_id=3210_0

RE: Review 3: Digital Continuous Rotation (360°) Servo Part 1

Workshopshed — Sat, 04 Apr 2015 08:07:22 GMT

Perhaps the servo could be used to make a mini turntable?

When attaching the horn, use the smaller screws. The long screws are used with the rubber gromits and metal collars to give an anti vibration mount.

RE: Review 3: Digital Continuous Rotation (360°) Servo Part 1

mcb1 — Fri, 03 Apr 2015 22:41:26 GMT

Jan

They usually disconnect the mechanical link to the pot inside.

It's possible this one has no pot inside.

The best solution for your project is to obtain a normal servo .... or see if you can fix this one.

Adding other sensors for the In/Out position is adding more complexity.

Mark